SModelS: a new physics tool

Die Software SModelS zerlegt Theorien jenseits des Standardmodells, die eine Z2-Symmetrie aufweisen und konfrontiert diese mit Ergebnissen des LHC Experiments am CERN. Es werden Ergebnisse in Form von vereinfachten Modellen verwendet, wodurch der Vergleich modellunabhängig durchgeführt werden kann. Die aktuelle Version ist fokussiert auf Ergebnisse mit fehlender Energie (MET) im Endzustand und enthält derzeit über 100 solcher Ergebnisse von den Experimenten ATLAS und CMS. Da sowohl in der Theorie als auch bei den Experimenten das Interesse an Suchen mit anderen Endzuständen als fehlender Energie stetig wächst, wird SModelS derart weiterentwickelt. Ein erster Schritt in dieser Richtung wurde in der letzten Veröffentlichung getan, in der einige Ergebnisse mit schweren stabilen geladenen Teilchen im Endzustand hinzugefügt wurden. In dieser Arbeit wird die neuste Version von SModelS präsentiert, die demnächst veröffentlicht wird. Diese beinhaltet die Einführung einer komplett objekt-orientierten Beschreibung der Teilchen, wodurch ermöglicht wird, dass Ergebnisse mit anderen Endzuständen als fehlender Energie auf eine generelle Art und Weise untersucht werden können. Die Modifizierung vereinfacht es, die Eigenschaften der Teilchen wie Masse und Eigenzeit zu handhaben, was für solche Ergebnisse notwendig ist. Es wird gezeigt, wie nun auch Ergebnisse, die eine Abhängigkeit von der Halbwertszeit der Teilchen aufweisen, verwendet werden können und ein Beispiel dafür wird präsentiert.SModelS is a tool designed to decompose Beyond the Standard Model (BSM) theories with a Z2-symmetry and confront them with results from the LHC experiments at CERN. The code uses simplified model results to achieve the task in a model independent way. The existing version focuses on searches for supersymmetry with missing energy (MET) final states and includes a large variety of searches from the experiments ATLAS and CMS. Ongoing development is aimed at exploring beyond MET signatures of current interest within the theory and experimental communities. A first step in this direction was taken in the last release where results with heavy stable charged particles were included for the first time. The upcoming SModelS update is presented which includes a completely object oriented description of the particles and thus allows to probe BSM models containing non-MET signatures more generally. The modifications facilitate the inclusion of the particles’ properties such as mass and lifetime which is imperative to investigate other signatures. Results with a lifetime dependence can now be handled and an example thereof is shown

Search for Heavy Resonances inFour-Top-Quark Final States in pppp Collisionsat s\sqrt{s} = 13 TeV With the ATLAS Detector

A search for heavy resonances with a mass of 1 TeV or more in four-top-quark events is presented.This search uses proton-proton-collision data collected with the ATLAS detector at the Large HadronCollider (LHC) during Run 2 in the years 2015-2018 at a center-of-mass energy of √ = 13 TeV. Therare four-top-quark final state can be investigated for the first time with this data set corresponding toan integrated luminosity of 139 fb−1. It offers a unique way to probe top-philic resonances ′ whichwould predominantly be produced in association with top quarks ̄′ → ̄ ̄ and are inaccessible byconventional searches. Events with exactly one reconstructed lepton are selected in this search. Theparticular configuration where the resonance decays fully hadronically is investigated by explicitlyreconstructing the resonance. The mass spectrum mJJ is obtained from two reconstructed jetscollecting the decay products of the two top quarks from the resonance and is investigated in therange between 1 TeV and 3.2 TeV. In a model-independent interpretation, the data is compared to theexpected mJJ distribution. No excess is observed. In a model-dependent interpretation, upper limitson the cross section are computed for six resonance masses between 1 TeV and 3 TeV assuming asimplified model with fixed coupling of the top quark to the resonance. The observed (expected)limits range between 59 (52) fb for a resonance mass of 1 TeV and 11 (10) fb for a resonance massof 3 TeV. Furthermore, upper limits are presented for different values of the coupling between topquarks and the resonance.The reach of the LHC is extended to open up more possibilities for discoveries by increasing theprecision of measurements and investigating even rarer processes. The LHC and its detectors arescheduled for an extensive upgrade, enabling them to collect a total integrated luminosity of 3 ab−1.A major upgrade of ATLAS is the replacement of its inner detector. The new Inner Tracker (ITk)consists of a pixel silicon detector at small radius and a silicon strip detector at larger radius. Theservice trays are components of the mechanical structure of the ITk strip detector endcaps in theforward regions. They hold the cooling services and guide the electrical services to the detectorcomponents. The development of the final design of the service trays is presented. The qualityassurance tests of the service trays are discussed and confirm that the produced service trays meetthe required specifications. All service trays for the endcaps are built and ready for assembly withthe other structural components

Constraining new physics with SModelS version 2

We present version 2 of SModelS, a program package for the fast reinterpretation of LHC searches for new physics on the basis of simplified model results. The major novelty of the SModelS v2 series is an extended topology description with a flexible number of particle attributes, such as spin, charge, decay width, etc. This enables, in particular, the treatment of a wide range of signatures with long-lived particles. Moreover, constraints from prompt and long-lived searches can be evaluated simultaneously in the same run. The current database includes results from searches for heavy stable charged particles, disappearing tracks, displaced jets and displaced leptons, in addition to a large number of prompt searches. The capabilities of the program are demonstrated by two physics applications: constraints on long-lived charged scalars in the scotogenic model, and constraints on the electroweak-ino sector in the Minimal Supersymmetric Standard Model

Constraining new physics with SModelS version 2

We present version 2 of SModelS, a program package for the fast reinterpretation of LHC searches for new physics on the basis of simplified model results. The major novelty of the SModelS v2 series is an extended topology description with a flexible number of particle attributes, such as spin, charge, decay width, etc. This enables, in particular, the treatment of a wide range of signatures with long-lived particles. Moreover, constraints from prompt and long-lived searches can be evaluated simultaneously in the same run. The current database includes results from searches for heavy stable charged particles, disappearing tracks, displaced jets and displaced leptons, in addition to a large number of prompt searches. The capabilities of the program are demonstrated by two physics applications: constraints on long-lived charged scalars in the scotogenic model, and constraints on the electroweak-ino sector in the Minimal Supersymmetric Standard Model

Constraining new physics with SModelS version 2

International audienceWe present version 2 of SModelS, a program package for the fast reinterpretation of LHC searches for new physics on the basis of simplified model results. The major novelty of the SModelS v2 series is an extended topology description with a flexible number of particle attributes, such as spin, charge, decay width, etc. This enables, in particular, the treatment of a wide range of signatures with long-lived particles. Moreover, constraints from prompt and long-lived searches can be evaluated simultaneously in the same run. The current database includes results from searches for heavy stable charged particles, disappearing tracks, displaced jets and displaced leptons, in addition to a large number of prompt searches. The capabilities of the program are demonstrated by two physics applications: constraints on long-lived charged scalars in the scotogenic model, and constraints on the electroweak-ino sector in the Minimal Supersymmetric Standard Model

Constraining new physics with SModelS version 2

We present version 2 of SModelS, a program package for the fast reinterpretation of LHC searches for new physics on the basis of simplified model results. The major novelty of the SModelS v2 series is an extended topology description with a flexible number of particle attributes, such as spin, charge, decay width, etc. This enables, in particular, the treatment of a wide range of signatures with long-lived particles. Moreover, constraints from prompt and long-lived searches can be evaluated simultaneously in the same run. The current database includes results from searches for heavy stable charged particles, disappearing tracks, displaced jets and displaced leptons, in addition to a large number of prompt searches. The capabilities of the program are demonstrated by two physics applications: constraints on long-lived charged scalars in the scotogenic model, and constraints on the electroweak-ino sector in the Minimal Supersymmetric Standard Model

New developments in SModelS

International audienceSModelS is an automatized tool enabling the fast interpretation of simplified model results from the LHC within any model of new physics respecting a $\mathbb{Z}_2$ symmetry. In this contribution, we report on two important updates of SModelS during 2020: the extension of the SModelS' database with 13 ATLAS and 10 CMS analyses, including 5 ATLAS and 1 CMS analyses at full Run~2 luminosity, and the ability to use full likelihoods now provided by ATLAS in the form of pyhf JSON files. Moreover, we briefly explain how to use SModelS and give an overview of ongoing developments

R3BRootGroup/R3BRoot: R3BRoot Release November 2023

Framework for Simulations and Data Analysis of R3B Experimen